EP4204384A2 - Procédé de fabrication d'une composition à base d'urée comprenant l'ajout d'un additif sous une forme aqueuse - Google Patents

Procédé de fabrication d'une composition à base d'urée comprenant l'ajout d'un additif sous une forme aqueuse

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Publication number
EP4204384A2
EP4204384A2 EP21823460.7A EP21823460A EP4204384A2 EP 4204384 A2 EP4204384 A2 EP 4204384A2 EP 21823460 A EP21823460 A EP 21823460A EP 4204384 A2 EP4204384 A2 EP 4204384A2
Authority
EP
European Patent Office
Prior art keywords
urea
section
weight
melt
based composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21823460.7A
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German (de)
English (en)
Inventor
Ruud Van Belzen
Filip COLPAERT
Francois Ledoux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yara International ASA
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Yara International ASA
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Filing date
Publication date
Application filed by Yara International ASA filed Critical Yara International ASA
Publication of EP4204384A2 publication Critical patent/EP4204384A2/fr
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C05C9/005—Post-treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
    • Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

Definitions

  • This invention relates to a method for the manufacture of a homogeneous, solid, particulate, urea-based composition
  • a urease inhibitor of the type phosphoric triamide for reducing ammonia loss by urease activity in the soil and volatilization of the resulting ammonia
  • a nitrification inhibitor for reducing the loss of nitrogen through leaching and denitrification
  • stabilizers that may improve the chemical stability of either inhibitor.
  • Urea is the most common nitrogen-containing fertilizer. Urea has the highest nitrogen content of all nitrogen-containing fertilizers in common use (46 %). Its consumption worldwide has been considerably increased, from about 20 million tons in the early seventies to about 100 million tons at the beginning of the twenty first century. Nitrogen is a basic element for any living system as a constituent of protein.
  • Urea is often used as such, but also as a component of a particulate blend, i.e., a physical blend (compound fertilizer) or melt blend (complex fertilizer), containing additional (primary and secondary nutrient) elements, such as potassium, phosphor, nitrogen and sulphur to obtain a particulate NPK(S), NP(S) or NK(S) blend, and other elements such as magnesium and calcium (secondary nutrients).
  • urea can easily be blended with, for example, potassium sulphate (sulphate of potash, SOP) and potassium magnesium sulphate (sulphate of potash magnesia).
  • Urea can also be blended with sodium nitrate (Chilean nitrate 16-0-0), ammonium sulphate (sulphate of ammonia), urea ammonium sulphate (UAS), mono ammonium phosphate (MAP), di-ammonium phosphate (DAP), rock phosphate, potassium chloride (muriate of potash, MOP) and urea calcium nitrate (UCAN).
  • sodium nitrate Chilean nitrate 16-0-0
  • ammonium sulphate sulphate of ammonia
  • UAS urea ammonium sulphate
  • UAS urea ammonium sulphate
  • MAP mono ammonium phosphate
  • DAP di-ammonium phosphate
  • rock phosphate rock phosphate
  • potassium chloride muriate of potash, MOP
  • UCAN urea calcium nitrate
  • Particulate urea can hardly be mixed and stored as a blend with certain chemicals due to hygroscopic double salt formation or release of crystal water but can be mixed, and co-applied shortly after, with calcium nitrate, ammonium nitrate, calcium ammonium nitrate or limestone ammonium nitrate, ammonium sulphate nitrate, potassium ammonium nitrate (nitropotash), superphosphate, and triple superphosphate.
  • urea particles can be "doped” or coated with elemental sulphur to supply sulphur, or indirectly sulphates, to the soil, preferably in sulphur-deficient soils.
  • Urea is first hydrolysed in the soil under the action of an enzyme, commonly called urease, to produce ammonia and carbon dioxide.
  • Ureases are found in numerous bacteria, fungi, algae, plants and some invertebrates, as well as in soils, as a soil enzyme.
  • Urea hydrolysis tends to increase the pH of its environment as the ammonia is dissolved into the water in the soil, and part of the ammonia can also be released into the atmosphere, a process called ammonia volatilization, thus becoming unavailable for the plant. About 50 weight% of nitrogen can sometimes be lost as a result of the volatilization of ammonia, all depending on the soil type, water content, pH, climate conditions, etc.
  • Urease inhibitors are compounds that are capable of temporarily reducing the activity of the enzyme and slow down the rate at which urea is hydrolysed, avoiding peaks of ammonia concentration and therefore limiting the losses to the air.
  • Nitrification inhibitors are compounds that are capable of temporarily reducing the rate at which ammonium is converted into nitrate, thus reducing nitrogen loss through denitrification and leaching, by depressing the activity of Nitrosomas bacteria.
  • nitrification inhibitors include, but are not limited to, dicyandiamide (DCD), 2- chloro-6-trichloromethylpyridine (nitrapyrin), dimethylpyrazole (DMP)-based compounds, such as 3,4-dimethylpyrazole phosphate (DMPP), 3-methylpyrazole (MP); l-H-l,2,4-triazole (TZ); 3- methylpyrazole-l-carboxamide (CMP); 4-amino-l,2,4-triazole (AT, ATC); 3-amino-l,2,4-triazole; 2-cyanimino-4-hydroxy-6- methylpyrimidine (CP); 2-ethylpyridine; ammonium thiosulfate (ATS); sodium thiosulfate (ST); thiophosphoryl triamide; thiourea (TU); guanylthiourea (GTU); ammonium polycarboxy
  • nBTPT N-(n-butyl) thiophosphoric triamide
  • This compound is actually the precursor for the active compound N-(n-butyl) phosphoric triamide (nBPT), obtained through oxidation of the thio-compound, but it is the thio-compound that is commonly produced, sold and used.
  • nBPT N-(n-butyl) phosphoric triamide
  • phosphoric triamide compounds When combined with a urea-containing fertilizer, phosphoric triamide compounds reduce the rate at which urea is hydrolysed to ammonia in the soil.
  • the benefits that are realized as a result of the delayed urea hydrolysis include the following: (1) nutrient nitrogen is available to the plant over a longer period of time, (2) excessive build-up of ammonia in the soil following the application of the urea-containing fertilizer is avoided, (3) the potential for nitrogen loss through ammonia volatilization is reduced, (4) the potential for damage by high levels of ammonia to seedlings and young plants is reduced, (5) plant uptake of nitrogen is increased, and (6) an increase in crop yields is attained. While phosphoric triamide compounds do not directly influence the rate of ammonium nitrification, they do control the levels of ammonium which are subject to the nitrification process and thereby indirectly controls the levels of nitrate nitrogen in the soil.
  • the urea inhibitor of the type phosphoric triamide in particular nBTPT, is added to urea granules as a coating. This can be done in the urea production plant, after storage and/or just before shipment, or before the distribution of the urea on the field, using commercially available post-processing equipment, such as a drum coater.
  • the urea inhibitor of the type phosphoric triamide is most frequently added to the urea granules as an organic solution, i.e. a composition wherein the urease inhibitor is dissolved in an organic, i.e., non-aqueous solvent.
  • the urease inhibitor is used in this way, it is preferably used as a 0.1 to 75 weight% solution, preferably as a 15 to 30 weight% solution.
  • Commercial solutions are available, for example as Agrotain® Ultra (Koch, US), N YieldTM (Eco Agro, US), Rhodia Ag-RhoTM N Protect B (Solvay, Germany), Iper N-Protect Liquid (Van Iperen, The Netherlands), and BASF Limus (BASF, Germany). A lot of research has been devoted to the manufacture of such organic solutions and their stability.
  • Claimed stabilizers are alkaline-forming or alkaline inorganic compounds, such as metal oxides, carbonates, hydroxides and acetates, in particular calcium oxide, sodium hydroxide, sodium hydrogen carbonate, sodium carbonate, borax, zinc oxide, magnesium oxide, calcium carbonate, and any mixture thereof (W02017/081183, WO2017/042194, WO2018/069486, WO2018/ 162533, all by Yara International ASA) , cationcontaining compounds wherein the cation is Ca 2+ , Mg 2+ , Li + , Fe 2+ , Fe 3+ , Al 3+ , Ag + , Cu 2+ , Zn 2+ , Hg 2+ , Pb 2+ , Ba 2+ , or a quaternary
  • the aforementioned inhibitors and stabilizers are usually added to the produced urea- based fertilizer granule as a coating, for example using a rotating drum.
  • a rotating drum When added in solid particulate form to the produced urea-based fertilizer granules, this poses a dust problem.
  • liquid form to the produced urea-based fertilizer granules (which are hygroscopic), this poses the problem of having to use non-aqueous solvent systems in order not to dissolve the urea granules before use, but which solvent systems are foreign to an agricultural produce.
  • a urea inhibitor of the type phosphoric triamide, a nitrification inhibitor, and stabilizers thereof has a significant odour and when used as a solid additive applied to fertilize granules, gives off a significant smell.
  • the use of non-aqueous solvent systems introduces chemical compounds to the fertilizer that are alien to the soil or to the production system of urea.
  • non-aqueous solvent costs are higher than aqueous solvent costs.
  • applying a toxic additive such as the urea inhibitor nBTPT on the surface of particles produces toxic dust coming off during handling of the particles, which in turn requires protective and safety measures for human operators and fertilizer handlers.
  • the inventors have now found a method for the manufacture of a homogeneous, solid, particulate, urea-based composition comprising urea and an additive, comprising a step where the additive is introduced into the urea in an aqueous form, i.e. as an aqueous suspension of particulate solid material, as an aqueous liquid of said additive, or as an aqueous dispersion of said additive.
  • the further addition of water has no significant effect on the quality of the urea or the urea-forming process, such that the method according to the invention can be implemented in any standard urea plant.
  • US 5,352,265 discloses a process for the incorporation of NBTPT and dicyandiamide (DCD) into a homogeneous fertilizer composition by blending a concentrated solution of NBTPT in a solvent, selected from the group consisting of liquid amides, 2-pyrrolidone, and N-alkyl-2-pyrrolidones directly into the molten urea prior to its granulation ; the DCD may be added to the urea melt as a solid or in dissolved form along with the NBTPT.
  • a solvent selected from the group consisting of liquid amides, 2-pyrrolidone, and N-alkyl-2-pyrrolidones directly into the molten urea prior to its granulation ; the DCD may be added to the urea melt as a solid or in dissolved form along with the NBTPT.
  • CN 102503687 (Stanley Chemical Fertilizer Stock Co., 2012) discloses a method for producing a melt-granulated fertilizer, where a urease inhibitor, a nitrification inhibitor, a polypeptide synergist and a urea melt are mixed and melted at low temperature and together with MAP, potassium chloride and talcum powder are mixed into a urea melt and granulated.
  • WO 2014/028759 discloses a urea granules composition
  • a urea granules composition comprising urea formaldehyde polymer (UFP) particles coated with nBTPT.
  • UFP formaldehyde polymer
  • Said coated UF particles can be mixed with the urea granules as a coating or can be mixed into the urea melt before granulation, either dry or as a concentrated solution of nBTPT/substantially spherical UFP.
  • WO 2015/027244 discloses a method for producing a solid urea-nitrogen stabilizer composition, wherein the nitrogen stabilizer composition is selected from the group of a urease inhibitor composition and a nitrification inhibitor composition, comprising the step of adding said composition to molten urea with a water content of less than 0.2 weight% and wherein the time between the cooling of the molten urea-nitrogen stabilizer composition is less than 20 seconds.
  • the solvent systems disclosed are all organic solvent-based, such as NMP.
  • WO 2016/137815 discloses a urea-nitrogen stabilizer fertilizer composition having a nitrogen stabilizer and carrier system substantially homogeneously dispersed throughout the granule thickness using the method of WO 2015/027244.
  • the carrier system can comprise any solvent system that is both: (I) stable at urea melt temperatures of about 120C; (2) able to solvate the nitrogen stabilizer; and (3) miscible in molten urea.
  • Such carrier systems can be blends of NMP and a glycol (e.g., propylene glycol), but not water.
  • WO 2017/081183 Al (Yara, 2017) and WO 2018/162533 (Yara, 2018) disclose a method for the manufacture of a solid, particulate, urea-based blend composition wherein nBTPT was stabilized using a stabilizer and added to a urea melt and subsequently, the mixture was granulated in a fluidized bed granulator. Solid nBTPT was added to a urea melt, which was subsequently granulated in a fluidized bed granulator.
  • EP3626697A1 (Tessenderlo Kerley, 2020) discloses a method for the manufacture of a urea-based fertilizer, wherein additives, such as urease inhibitors and/or nitrification inhibitors, are added to a urea melt.
  • GB1113735A (Inventa, 1968) discloses a method, wherein aqueous solutions of different chemicals are added to a urea melt, and the melt is subsequently prilled.
  • an additive such as one selected from the group of a urease inhibitor of the type phosphoric triamide, a nitrification inhibitor, and an alkaline-forming or alkaline inorganic compound, can be added to a urea melt in a precise dose using different addition points in the process for the production of urea or urea-based compounds, wherein the additive is introduced into the urea or urea- based composition as an aqueous suspension of particulate solid material, as an aqueous liquid of said additive, or as an aqueous dispersion of said additive.
  • the invention relates to a method for the manufacture of a homogeneous, solid, particulate, urea-based composition comprising urea and one or more additives in a urea production plant comprising at least an evaporator section and a particulation section, further comprises one or more of a mixing section, an effluent gas treatment section and a scrubber solution storage section, wherein the method comprises at least the steps of:
  • particulation section in the particulation section, particulating a urea or urea-based melt into a urea or urea- based composition; and further comprises one or more of the steps of:
  • said urea melt such as said urea melt of about 80 weight%, upstream of the evaporation section;
  • the present disclosure provides a method for the manufacture of a homogeneous, solid, particulate, urea-based composition comprising urea and an additive, in a urea production plant comprising at least an evaporator section, a particulation section, and an effluent gas treatment section, and optionally a scrubber solution storage section and/or a mixing section, wherein the method comprises at least the steps of:
  • Figure 1 represents the workflow of an embodiment of the method according to the present disclosure.
  • weight percent refers to the relative weight of the respective component based on the overall weight of the formulation.
  • particulate form a physical form that can also be designated as granulated, prilled, crystalline, compacted, powdered, and the like, wherein the respective compound is in a small unitary form.
  • a urea melt is a particular form of a urea-based melt, wherein the melt does not contain any major components, other than urea.
  • a urea-based melt is a urea melt which contains another major matrix component, such as ammonium sulphate.
  • stabilizer a compound which is able to improve the chemical stability of either the urease inhibitor, the nitrification inhibitor, or both.
  • aqueous suspension any composition wherein the additive is at least suspended as a particulate solid in water. Examples are nBTPT in water, calcium oxide in water or magnesium sulphate in water.
  • the suspension may contain suspension stabilizers, wetting agents, surface-active compounds and the like.
  • aqueous dispersion any composition wherein the additive is an at least partly water-immiscible liquid that is intimately mixed with water, wherein either the water or the at least partly water-immiscible liquid is the continuous phase.
  • aqueous liquid a liquid that comprises from 80 to 100 weight% of water and which may contain up to 20 weight% of further solvents which are miscible with water at room temperature, such as methyl alcohol, ethyl alcohol and the like.
  • the invention is concerned with a method for the manufacture of a homogeneous, solid, particulate, urea-based composition comprising urea and one or more additives in a urea production plant comprising at least an evaporator section and a particulation section, wherein the method comprises at least the steps of:
  • particulation section particulating a urea or urea-based melt into a urea or urea- based composition; wherein the additive is introduced into the urea as an aqueous suspension, an aqueous dispersion, or an aqueous liquid, by adding the additive to:
  • the urea plant only comprises an evaporation section (which is always required to remove the water from the urea melt such that a urea melt of 80 weight of urea is concentrated into a urea melt of 95 weight%, or even 99 weight% using one or more evaporation units) and a particulation section (which is always required to convert the liquid urea melt into solid urea particles), the additive is introduced into said urea melt of about 80 weight% upstream of the evaporation section.
  • the additive is added as an aqueous liquid or aqueous suspension to said urea melt of about 80 weight% upstream of the evaporation section.
  • the water is removed by the evaporation section shortly after its addition thereof to the urea.
  • the urea production plant comprising at least an evaporator section and a particulation section, further comprises one or more of a mixing section, an effluent gas treatment section and a scrubber solution storage section; wherein the method comprises at least the steps of:
  • particulation section in the particulation section, particulating a urea or urea-based melt into a urea or urea- based composition; and further comprises one or more of the steps of:
  • the additive may be introduced into the urea as an aqueous suspension, an aqueous dispersion, or an aqueous liquid, by adding the additive to one or more of the following four alternatives:
  • a urea melt with a water content above 5 weight% such as from 40 to 85 weight%, from 50 to 85 weight%, from 60 to 85 weight%, or from 70 to 85 weight% is concentrated to a urea melt comprising from 95 to 99 weight% of urea.
  • the evaporator section produces a urea melt comprising from 0.1 to 5 weight%, from 0.5 to 5 weight%, or from 1 to 5 weight% of water.
  • the additive is suitably introduced into the urea or urea-based composition as an aqueous suspension, an aqueous dispersion, or an aqueous liquid.
  • the urea or urea-based composition as an aqueous suspension, an aqueous dispersion, or an aqueous liquid.
  • one or more of the above may be preferred.
  • the additive is added as an aqueous liquid or aqueous suspension.
  • the additive is added as an aqueous suspension, in particular to said urea melt in the mixing section.
  • the mixing section is an optimal location as the mixing section comprises addition and mixing means that are designed to mix in additives or other compounds into the urea melt.
  • the additional water is not removed before the granulation step.
  • the additive is added as an aqueous suspension or aqueous solution to the effluent gas treatment section, in particular to the water that is used in the effluent gas treatment section for treating the effluent gas from the particulation section comprising urea dust particles and ammonia gas to produce a scrubber solution.
  • the water supply acts as an entry point for the additive.
  • the additive is subsequently transported within the scrubber solution to the evaporator section, to the particulation section or to the mixing section, optionally via a scrubber solution storage section.
  • the additive can also be added as an aqueous suspension or aqueous solution to a scrubber solution storage tank in the scrubber solution storage section containing the scrubber solution.
  • the scrubber solution is subsequently transported to a scrubber evaporator, where the bulk of the water is removed. Thereafter, the resulting solution is added to the mixing section where it is mixed in with the highly concentrated urea melt, or is introduced in the particulation section.
  • the additive can also be added as an aqueous suspension or aqueous solution to a small mixing tank, part of the scrubber solution storage section, where a portion of the scrubber solution is fed into from the main scrubber solution tank.
  • the additive is subsequently added to said small mixing tank and directly fed to the particulation section.
  • Adding the additive in the effluent gas treatment section and/or in the scrubber solution storage section has the advantage that the water content of the urea melt is not directly impacted by the addition of the additive.
  • the addition of the scrubber solution back into the urea melt is the only dilution operation carried out, so it may be easier to regulate the final water content of the urea melt or the amount of evaporation required by the melt before the granulation.
  • the scrubber solution with the desired chemical composition may be directed to the production process, upstream, i.e. before, of the particulation stage.
  • the scrubber solution may be added to the melt before it enters the evaporator section of step (i), or may be added in the mixing section, if present, of step (iv).
  • the urea or urea-based melt particulated in step (ii) comprises the additive that was originally added in the effluent gas treatment section or the scrubber solution storage section.
  • each of the addition methods a), b), c), and d) can be combined to have multiple additions to the urea or urea-based product.
  • the particulation section is selected from the group of fluidized bed granulator, pan granulator, drum granulator, prilling tower, spherodizer, and pastillizer.
  • Each of these particulation sections starts from a melt as feed material and granulates said melt into a homogeneous, solid, particulate composition, either by action of accretion (fluidized bed) or agglomeration.
  • the particulation section requires a stream of gas to cool down the solid, particulate composition produced therein. While cooling down the solid, particulate composition, it becomes contaminated with pollutants, such as urea dust or urea-based dust and ammonia gas.
  • pollutants such as urea dust or urea-based dust and ammonia gas.
  • the stream of polluted gas is often treated in a gas effluent treatment section to remove some or all of the pollutants before the gas stream is released in the atmosphere.
  • the gas effluent treatment section may comprise a scrubber, in particular a wet scrubber.
  • a wet scrubber comprises a section wherein the gas stream is passing through wetted screens that capture the pollutants.
  • An aqueous solution such as water, in the form of vapor or droplets, may be added to the gas stream to improve the capture rate of the pollutants by the screens.
  • the particulation section is a fluidized bed granulator.
  • the present disclosure provides a method for the manufacture of a homogeneous, solid, particulate, urea-based composition comprising urea and an additive, in a urea production plant comprising at least an evaporator section, a particulation section, and an effluent gas treatment section and optionally a scrubber solution storage section, and/or a mixing section, wherein the method comprises at least the steps of:
  • the urea production plant comprises an effluent gas treatment section.
  • the effluent gas treatment section comprises one device, such as a scrubber, for treating the effluent gas from the particulation section comprising urea-based dust particles and ammonia gas with an aqueous solution, such as water, to produce a scrubber solution.
  • the evaporation section may receive a urea melt with a urea concentration not equal to 80 weight%.
  • the urea melt directed to the evaporation section may have a concentration of from 40 to 85 weight%, from 50 to 85 weight%, from 60 to 85 weight%, or from 70 to 85 weight%.
  • the additive is one or more, selected from the group of a urease inhibitor of the type phosphoric triamide, a nitrification inhibitor, and an alkaline-forming or alkaline inorganic compound, a cation-containing compound, and magnesium sulphate/magnesium oxide mixtures. All these additives have been disclosed in the prior art.
  • the urease inhibitor of the type phosphoric triamide is a compound of formula I: wherein :
  • X is oxygen or sulphur
  • Ri is alkyl, cycloalkenyl, aralkyl, aryl, alkenyl, alkynyl, or cycloalkyl;
  • R2 is hydrogen, alkyl, cycloalkenyl, aralkyl, aryl, alkenyl, alkynyl, or cycloalkyl; or Ri and R 2 together may form an alkylene or alkenylene chain which may optionally include one or more heteroatoms of divalent oxygen, nitrogen or sulphur completing a 4, 5, 6, 7, or 8 membered ring system; and
  • R3, R4, Rs and Rs are individually hydrogen or alkyl having 1 to 6 carbon atoms.
  • phosphoric triamide compounds is used to refer to the compounds of formula I.
  • alkyl, cycloalkenyl, aralkyl, aryl, alkenyl, alkynyl, and cycloalkyl refer to compounds having from up to 10 carbon atoms, preferably up to 6 carbon atoms. The lowest number of carbon atoms is between 1-3 depending on the structure of the substituent.
  • the urease inhibitor is N-(n-butyl) thiophosphoric triamide (nBTPT).
  • nBTPT N-(n-butyl) thiophosphoric triamide
  • nBTPT refers not only to N-(n-butyl) thiophosphoric triamide in its pure form, but also to industrial grades of this compound which may contain up to 50 weight% impurities, depending on the method of synthesis and purification scheme(s), if any, employed in the production of the nBTPT.
  • the urease inhibitor is used in its particulate form, it is used as a powder, preferably with a purity of 97 weight% or more. It is available, for example, from Sunfit Chemical Co. (China). In embodiments where the urease inhibitor is used in its particulate form, it is preferably used as a 0.1 to 75 weight% dispersion, preferably as a 15 to 30 weight% dispersion.
  • the urease inhibitor of the type phosphoric triamide in particular N-(n-butyl) thiophosphoric triamide (nBTPT) is added to the urea-based composition at a level of 0.0001 to 1% weight%, preferably at a level of 0.02 to 0.2% weight%, most preferably at a level of 0.04 to 0.06 weight%, relative to the total weight of the urea-based composition.
  • nBTPT N-(n-butyl) thiophosphoric triamide
  • the nitrification inhibitor is selected from the group of dicyandiamide (DCD), 2-chloro-6-trichloromethylpyridine (nitrapyrin), dimethylpyrazole (DMP)-based compounds, such as 3,4-dimethylpyrazole phosphate (DMPP), 3-methylpyrazole (MP); l-H-l,2,4-triazole (TZ); 3-methylpyrazole-l-carboxamide (CMP); 4- amino-l,2,4-triazole (AT, ATC); 3-amino-l,2,4-triazole; 2-cyanimino-4-hydroxy-6- methylpyrimidine (CP); 2-ethylpyridine; ammonium thiosulfate (ATS); sodium thiosulfate (ST); thiophosphoryl triamide; thiourea (TU); guanylthiourea (GTU); ammonium polycarboxylate; ethylene urea; hydroquinone; phenylace
  • DCD dicyand
  • the nitrification inhibitor is added to the urea-based composition at a level of 0.0001 to 1% weight%, preferably at a level of 0.02 to 0.2% weight%, most preferably 0.04 to 0.06 weight%, relative to the total weight of the urea-based composition.
  • the alkaline-forming or alkaline inorganic compound is selected from the group of metal oxides, carbonates, hydroxides, acetates, and any mixture thereof. More in particular, the alkaline-forming or alkaline compound is selected from the group of calcium oxide, sodium hydroxide, sodium hydrogen carbonate, sodium carbonate, borax, zinc oxide, magnesium oxide, calcium carbonate, and any mixture thereof.
  • the alkaline-forming or alkaline compound is added to the urea- based composition at a level of 0.02 to 1 weight%, preferably at a level of 0.05 to 1 weight%, relative to the total weight of the composition.
  • the cation in the cation-contain- ing compound is Ca 2+ , Mg 2+ , Li + , Fe 2+ , Fe 3+ , Al 3+ , Ag + , Cu 2+ , Zn 2+ , Hg 2+ , Pb 2+ , Ba 2+ , or a quaternary ammonium group comprising at least three groups selected from Ci. 2 -alkyl, and Ci-2-hydroxy- alkyl.
  • the cation in the cation-containing compound is magnesium sulphate.
  • the cation-containing compound is added to the urea-based composition at a level of 0.02 to 1 weight%, preferably at a level of 0.05 to 1 weight%, relative to the total weight of the composition.
  • the additive is a mixture of magnesium sulphate and magnesium oxide.
  • the magnesium sulphate/mag- nesium oxide mixture is added to the urea-based composition at a level of 0.02 to 1 weight%, preferably at a level of 0.05 to 1 weight%, relative to the total weight of the composition.
  • the solid, particulate, urea-based composition further comprises one or more compounds selected from the group of ammonium nitrate, calcium nitrate, calcium ammonium nitrate, sodium nitrate, ammonium sulphate nitrate, potassium ammonium nitrate, ammonium phosphate, such as mono-ammonium phosphate (MAP) and di-ammonium phosphate (DAP), calcium bis(dihydrogen orthophosphate), super phosphate, triple superphosphate, rock phosphate, potassium sulphate, potassium magnesium sulphate, ammonium sulphate (AS), urea ammonium sulphate, urea calcium ammonium nitrate, urea ammonium sulphate, potassium chloride (MOP), urea potassium salts (UK), elemental sulphur, or mixtures thereof. Any of these compounds added to urea produces the urea- based fertilizer. These compounds are particularly added to the group of ammonium nitrate
  • the solid, particulate, urea-based composition may comprise from about 40 to 99 weight% of urea.
  • the solid, particulate, urea-based composition is urea or urea ammonium sulphate (UAS).
  • the average particle size (dp50) of the solid, particulate, urea-based composition is between 0.5.0 mm and 5 cm, preferably between 1.0 mm and 1 cm, preferably between 1.0 mm and 6.0 mm, preferably between 2.0 mm and 4.0 mm, preferably between 3.0 mm and 5.0 mm, preferably between 2.5 mm and 3.6 mm, as determined by mesh sieve screening.
  • the solid, particulate, urea-based composition may contain elemental sulphur, may be coated with micronutrients or other nutrients, or may be treated in any other way. It may contain any other processing additive, such as granulation additive, typically a urea-formaldehyde condensate, etc.
  • a urea melt of about 80 weight % (containing about 20 weight% of water) and having a melt temperature of 110 °C is introduced into an evaporator, where the melt is concentrated up to 97 weight% of urea by evaporation of the water (concentration step 1).
  • concentration step 1 Prior to the introduction into the evaporator an aqueous suspension of 50 weight% of nBTPT in water is added to the melt, such that a final concentration of about 600 ppm in the urea melt is obtained.
  • the concentrated melt is subsequently mixed with an amount of ammonium sulphate at 110 °C in a mixing section and subsequently fed to a standard fluidized bed granulator to obtain a UAS composition of 23 weight% of AS, or 30 weight% of AS.
  • the effluent gas containing urea ammonium sulphate dust and ammonia gas is treated in an effluent gas treatment section, where they are captured into a scrubber solution.
  • Said scrubber solution is fed to a scrubber solution storage section, comprising a scrubber solution storage container (which works as a buffer) and subsequently pumped to a scrubber evaporator (concentration step 2) where the water content is reduced to about 3 weight%.
  • the concentrated scrubber solution is subsequently added to the mixing section where it is mixed with the concentrated urea ammonium sulphate.
  • the resulting granulated urea ammonium sulphate product contained about 550 ppm of nBTPT, and little degradation was observed.
  • the aqueous suspension of 50 weight% of nBTPT in water was added to the mixing section, the water used in the effluent gas treatment section, and added to the scrubber solution storage section.
  • the resulting granulated urea ammonium sulphate product contained about 550 ppm of nBTPT, and little degradation was observed.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Fertilizers (AREA)

Abstract

Est divulgué un procédé de fabrication d'une composition à base d'urée homogène, solide, particulaire, comprenant de l'urée et un ou plusieurs additifs dans une unité de production d'urée comprenant au moins une section d'évaporateur et une section de formation de particules, comprenant en outre une ou plusieurs sections parmi une section de mélange, une section de traitement d'effluent gazeux et une section de stockage de solution d'épurateur, le procédé comprenant au moins les étapes suivantes consistant à : (i) dans la section d'évaporateur, concentrer une masse fondue d'urée d'environ 80 % en poids à environ 95 à 99 % en poids d'urée ; (ii) dans la section de formation de particules, former des particules d'une matière fondue d'urée ou à base d'urée en une composition d'urée ou à base d'urée ; et comprenant en outre une ou plusieurs des étapes suivantes consistant à : (iii) dans la section de mélange, si elle est présente, mélanger la masse fondue d'urée d'environ 95 à 99 % en poids avec d'autres composants d'engrais pour produire une masse fondue à base d'urée ; (iv) dans la section de traitement d'effluent gazeux, si elle est présente, traiter l'effluent gazeux provenant de la section de formation de particules comprenant des particules de poussière à base d'urée et de l'ammoniac gazeux avec de l'eau pour produire une solution d'épurateur ; et (v) dans la section de stockage de solution d'épurateur, si elle est présente, stocker la solution d'épurateur provenant de la section de traitement de l'effluent gazeux ; l'additif étant introduit dans la composition d'urée ou à base d'urée sous forme de suspension aqueuse, de dispersion aqueuse, ou de liquide aqueux, par ajout de l'additif à un ou plusieurs des éléments suivants : (a) ladite section de traitement d'effluent gazeux, si elle est présente ; (b) ladite section de stockage de solution d'épurateur contenant la solution d'épurateur, si elle est présente ; (c) ladite masse fondue d'urée d'environ 80 % en poids en amont de la section d'évaporation ; (d) ladite masse fondue à base d'urée dans la section de mélange, si elle est présente.
EP21823460.7A 2020-12-21 2021-12-21 Procédé de fabrication d'une composition à base d'urée comprenant l'ajout d'un additif sous une forme aqueuse Pending EP4204384A2 (fr)

Applications Claiming Priority (2)

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EP20216183.2A EP4015492A1 (fr) 2020-12-21 2020-12-21 Procédé de fabrication d'une composition à base d'urée comprenant l'ajout d'un additif sous forme aqueuse
PCT/EP2021/086967 WO2022136360A2 (fr) 2020-12-21 2021-12-21 Procédé de fabrication d'une composition à base d'urée comprenant l'ajout d'un additif sous une forme aqueuse

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EP21823460.7A Pending EP4204384A2 (fr) 2020-12-21 2021-12-21 Procédé de fabrication d'une composition à base d'urée comprenant l'ajout d'un additif sous une forme aqueuse

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EP4293000A1 (fr) * 2022-06-16 2023-12-20 Yara International ASA Procédé de fabrication d'une composition d'engrais solide particulaire comprenant un additif

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WO2022136360A3 (fr) 2022-08-11
CA3197630A1 (fr) 2022-06-30
WO2022136360A2 (fr) 2022-06-30

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